package com.summer.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.summer.reggie.common.BaseContext;
import com.summer.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 完善用户登录, 过滤掉未登录的用户
 * 作者:夏天
 * qq:1205232048
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")//filterName过滤器的名字   urlPatterns过滤哪些路径
public class LoginCheckFilter implements Filter {
    //路径匹配器, 支持通配符, 该类位于spring下
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次的请求URL
        String requestURI = request.getRequestURI();
        log.info("拦截到请求{}",requestURI);
        //定义不需要处理的请求路径
        String [] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理, 直接放行

        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4.1 客户端 判断用户登录状态, 如果已登录, 则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录, 用户id为{}",request.getSession().getAttribute("employee"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }
        //4.2 用户端 判断用户登录状态, 如果已登录, 则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录, 用户id为{}",request.getSession().getAttribute("user"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5 如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配, 检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
